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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7e31640fcbed1a8393535c6b085666d88bd2a8eaa1d5a75687c3caedfaaa17' 
  AND token = 'TgqVodc8Oh1p7ZWREmfZegdPMcGxD8AU7/c0N+LUVXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}